body {
    margin: 0;
}

div {
    box-sizing: border-box;
}

h1,
h2,
h3,
h4,
h5,
h6,
p {
    margin: 0;
    font-weight: normal;
}

ul {
    padding: 0;
    margin: 0;
    list-style: none;
}

img {
    height: 100%;
}

a {
    text-decoration: none;
}

.list-hd {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1;
    width: 100%;
    height: 44px;
    background-color: orange;
    color: #fff;
    line-height: 44px;
    text-align: center;
}

.container {
    width: 100%;
    margin-top: 44px;
}

.container {
    padding: 15px;
    line-height: 25px;
}

.round {
    display: block;
    position: fixed;
    right: 25px;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    opacity: .6;
}

.round:hover {
    opacity: 1;
}

.s-top-btn {
    display: none;
    bottom: 100px;
    background: orange url(../img/pauseImg.png) no-repeat 0 0/100% 100%;


}

.play-btn {
    bottom: 25px;
    background: orange url(../img/playImg.png) no-repeat 15px 15px/30px 30px;
}